JP7127116B2 - Diffraction light guide plate and method for manufacturing diffraction light guide plate - Google Patents

Description

This specification claims the benefit of the filing date of Korean Patent Application No. 10-2017-0116701 filed with the Korean Intellectual Property Office on September 12, 2017, the entire contents of which are incorporated into the present invention.

The present invention relates to a diffractive light guide plate and a method for manufacturing the diffractive light guide plate.

Recently, as interest in display units that realize augmented reality (AR), mixed reality (MR), or virtual reality (VR) has increased, research has been conducted on display units that realize this. It tends to be active. A display unit that realizes augmented reality, mixed reality, or virtual reality is equipped with a diffractive light guide plate that utilizes the diffraction phenomenon based on the wave-dynamic properties of light. Such a diffractive light guide plate basically comprises three substrates on one surface of which a grid-like nano-pattern capable of diffracting light is formed. However, the diffractive light guide plate with three substrates has a problem that its thickness is large and it is rather heavy to realize weight reduction of a display unit that realizes augmented reality, mixed reality, or virtual reality.

In addition, a conventional method of manufacturing a diffractive light guide plate uses a roll-to-roll method to form a grid-like nano-pattern on a substrate. However, the roll-to-roll method has a high degree of process difficulty, and the efficiency of manufacturing the diffractive light guide plate is not high. Furthermore, in the case of the roll-to-roll method, an additional process such as a step of protecting the nano-pattern after forming the grid-like nano-pattern on the base material is required, which reduces the productivity of the diffraction light guide plate. The problem is that it is difficult to improve.

As such, there is a need for a technology that can effectively reduce the thickness and weight of the diffractive light guide plate and a technology that can easily manufacture the diffractive light guide plate.

The present specification seeks to provide a diffractive light guide plate and a method for manufacturing the diffractive light guide plate.

However, the problems to be solved by the present invention are not limited to the above problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

One embodiment of the present invention includes a first diffractive substrate and a second diffractive substrate provided on the first diffractive substrate, the first diffractive substrate having a first diffraction grating layer on one side. , and a second diffraction grating layer on one side, the second diffraction base includes a third diffraction grating layer on one side, and the first diffraction grating layer emits light with a wavelength of 550 nm or more and 700 nm or less. The second diffraction grating layer separates light with a wavelength of 400 nm or more and 550 nm or less, and the third diffraction grating layer provides a diffraction light guide plate that separates light with a wavelength of 450 nm or more and 650 nm or less.

Also, one embodiment of the present invention includes the steps of providing a first diffractive substrate comprising a first grating layer on one side and a second grating layer on the other side; and bonding the first diffraction substrate and the second diffraction substrate together. offer.

According to one embodiment of the present invention, the diffraction light guide plate includes a first diffraction base material having a first diffraction grating layer on one surface and a second diffraction grating layer on the other surface, so that the diffraction light guide plate thickness and weight can be effectively reduced.

According to one embodiment of the present invention, it is possible to easily manufacture a diffractive light guide plate with reduced thickness and weight.

The effects of the present invention are not limited to the effects described above, and effects not mentioned will be clearly understood by those skilled in the art from the present specification and the accompanying drawings.

It is a figure which shows roughly the diffraction light-guide plate which concerns on one embodiment of this invention. It is a figure which shows roughly the diffraction light-guide plate which concerns on one embodiment of this invention. It is a figure which shows roughly the diffraction light-guide plate which concerns on one embodiment of this invention. It is a figure which shows roughly the diffraction light-guide plate which concerns on one embodiment of this invention. The in-coupling angle and the out-coupling angle of the first diffraction substrate provided with the first diffraction grating layer and the second diffraction grating layer according to one embodiment of the present invention coupling angle). FIG. 4 shows in-coupling angles and out-coupling angles of a diffraction substrate having a first diffraction grating layer and a third diffraction grating layer; FIG. FIG. 3B is a diagram schematically showing a plane of a first diffraction grating layer according to an embodiment of the present invention; FIG. 4 is a diagram schematically showing a cross-section of a first diffraction substrate including a first diffraction grating layer according to one embodiment of the present invention; Fig. 3 schematically illustrates a first grating layer including a diffraction pattern according to one embodiment of the present invention; FIG. 4B is a diagram schematically showing a cross-section of a diffraction pattern included in a first diffraction grating layer according to one embodiment of the present invention; 6 shows simulation results of the optical diffraction efficiency of the diffraction grating layer according to the duty, height, and optical refractive index of pattern structures included in the diffraction grating layer according to one embodiment of the present invention. FIG. 4 is a diagram schematically showing a cross section of a diffraction light guide plate including first to third diffraction grating layers according to one embodiment of the present invention; FIG. 4 is a diagram schematically showing a cross section of a diffraction light guide plate including first to third diffraction grating layers according to one embodiment of the present invention; FIG. 2 schematically illustrates a first diffraction grating layer including first to third diffraction patterns according to one embodiment of the present invention; FIG. 2 schematically illustrates preparing a first diffractive substrate using two substrates according to an embodiment of the invention; 1 is a scanning electron microscope (SEM) photograph of a first diffraction grating layer according to Example 1 of the present invention; 4 is a scanning electron microscope (SEM) photograph of a second diffraction grating layer according to Example 1 of the present invention;

In this specification, when a part "includes" a component, it means that it can further include other components, rather than excluding other components, unless specifically stated to the contrary. do.

Throughout this specification, when a member is said to be "on" another member, this includes not only when the member is in contact with the other member, but also between the two members. It also includes cases where other members exist.

Throughout the specification of this application, when a part is "connected" to another part, it means "directly connected" as well as "with other elements interposed therebetween. ” including cases where they are concatenated.

Throughout this specification, "A and/or B" means "A and B, or A or B."

The present inventors formed a first diffraction grating layer on one surface of a first diffraction substrate and formed a second diffraction grating layer on the other surface of the first diffraction substrate to manufacture a diffraction light guide plate It has been found that the overall thickness and weight of the can be effectively reduced. Further, a first diffraction grating layer capable of separating a first light having a wavelength value of 550 nm or more and 700 nm or less is included on one surface, and a second diffraction grating layer capable of separating a second light having a wavelength value of 400 nm or more and 550 nm or less. on the other side can effectively prevent cross talk that can occur between the first light and the second light. A light plate and its manufacturing method were developed.

The present specification will be described in more detail below.

One embodiment of the present invention includes a first diffractive substrate and a second diffractive substrate provided on the first diffractive substrate, the first diffractive substrate having a first diffraction grating layer on one side. , and a second diffraction grating layer on one side, the second diffraction base includes a third diffraction grating layer on one side, and the first diffraction grating layer emits light with a wavelength of 550 nm or more and 700 nm or less. The second diffraction grating layer separates light with a wavelength of 400 nm or more and 550 nm or less, and the third diffraction grating layer provides a diffraction light guide plate that separates light with a wavelength of 450 nm or more and 650 nm or less.

According to one embodiment of the present invention, the diffraction light guide plate includes a first diffraction base material having a first diffraction grating layer on one surface and a second diffraction grating layer on the other surface, so that the diffraction light guide plate thickness and weight can be effectively reduced.

A display unit that realizes augmented reality (AR), mixed reality (MR), or virtual reality (VR) includes a diffraction light guide plate that utilizes a diffraction phenomenon based on the wave dynamic properties of light. I have. A conventional diffractive light guide plate basically comprises three substrates for diffracting light, and each of the three substrates has a grating pattern formed on one surface thereof. However, the conventional diffractive light guide plate including three substrates each having a grating pattern formed on one surface has the problem of being thick and heavy.

In contrast, according to an embodiment of the present invention, the diffraction light guide plate includes a first diffraction base material including a first diffraction grating layer on one side and a second diffraction grating layer on the other side. Therefore, the thickness and weight of the diffractive light guide plate can be effectively reduced. That is, the diffractive light guide plate includes two substrates, that is, the first diffractive substrate and the second diffractive substrate, so that the weight of the display unit including the diffractive light guide plate can be effectively reduced. Also, the volume of the display unit including the diffraction light guide plate can be effectively reduced.

According to one embodiment of the present invention, the first diffraction substrate may include a first diffraction grating layer on one side and a second diffraction grating layer on the other side, and the second diffraction substrate may include a third grating layer on one side. That is, a first diffraction grating layer is provided on one surface of the first diffraction substrate, a second diffraction grating layer is provided on the other surface, and a third diffraction grating layer is provided on one surface of the second diffraction substrate. A grating layer is provided.

According to one embodiment of the present invention, the first diffraction base material including the first diffraction grating layer and the second diffraction grating layer, and the second diffraction base material including the third diffraction grating layer are composed of: Light incident on one diffractive substrate and a second diffractive substrate can be guided to one point by internal reflection or total internal reflection. Specifically, the light incident on the first diffraction substrate is reflected or totally reflected inside the first diffraction substrate and emitted to a point different from the point where the light is incident on the first diffraction substrate. can do.

According to one embodiment of the present invention, the optical refractive index of each of the first diffraction substrate and the second diffraction substrate may be 1.5 or more and less than 2.0. Specifically, each of the first diffraction substrate and the second diffraction substrate can have an optical refractive index of 1.5 or more and less than 2.0 with respect to light with a wavelength of 400 nm or more and 700 nm or less. Also, the optical refractive index of the first diffraction substrate and the second diffraction substrate may be the same or different.

According to one embodiment of the present invention, the first diffractive base material and the second diffractive base material contain base materials commonly used in the industry as long as the base material maintains the optical refractive index within the above range. can be done. Specifically, TiO ₂ , Al ₂ O ₃ , Ga ₂ O ₃ , TeO ₂ , ZrO ₂ , Ta ₂ O ₅ , Nb ₂ O ₅ , ZnS, etc. are used as the first diffraction substrate and the second diffraction substrate. or a resin film containing at least one high refractive component can be used, but the types of the first diffractive substrate and the second diffractive substrate are not limited do not have.

According to one embodiment of the present invention, one surface of the first diffractive substrate faces one surface or the other surface of the second diffractive substrate, or the other surface of the first diffractive substrate faces the second diffractive substrate. It can face one side or the other side of the diffractive substrate. Specifically, the first diffraction grating layer included on one surface of the first diffraction base is adjacent to the third diffraction grating layer included on one surface of the second diffraction base. The second diffractive substrate can be provided on the diffractive substrate. Also, the second diffraction base may be provided on the first diffraction base such that the first diffraction grating layer is adjacent to the other surface of the second diffraction base. Further, the second diffraction substrate can be provided on the first diffraction substrate such that the second diffraction grating layer is adjacent to the third diffraction grating layer, the second diffraction grating layer comprising: The second diffractive substrate may be provided on the first diffractive substrate so as to be adjacent to the other surface of the second diffractive substrate.

1A to 1D are diagrams schematically showing a diffractive light guide plate according to one embodiment of the present invention. Specifically, FIG. 1A shows a first diffractive substrate 100 with a first grating layer 310 on one side and a second grating layer 320 on the other side, and a third grating layer 320 on one side. The second diffractive substrate 200 having the grating layer 330 is connected by the spacer 400, and the other surface of the first diffractive substrate 100 and the other surface of the second diffractive substrate 200 are provided facing each other. FIG. 10 is a diagram showing a diffractive light guide plate; FIG. 1B shows a state in which one surface of the first diffraction substrate 100 provided with the first diffraction grating layer 310 and the other surface of the second diffraction substrate 200 not provided with the third diffraction grating layer 330 face each other. FIG. 4 shows diffractive light guide plates connected by spacers 400; FIG. 1C shows a state in which the other surface of the first diffraction substrate 100 provided with the second diffraction grating layer 320 and the one surface of the second diffraction substrate 200 provided with the third diffraction grating layer 330 face each other. 4 shows a diffractive light guide plate connected by 400; FIG. FIG. 1D shows a state in which one surface of the first diffraction substrate 100 provided with the first diffraction grating layer 310 and the other surface of the second diffraction substrate 200 not provided with the third diffraction grating layer 330 face each other. FIG. 4 shows diffractive light guide plates connected by spacers 400;

According to one embodiment of the present invention, the grating layer of the first diffractive substrate is separated from the second diffractive substrate. Specifically, the first diffraction grating layer or the second diffraction grating layer is separated from the other surface of the third diffraction grating layer or the second diffraction base, and the It is provided separately from the second diffractive base. As shown in FIG. 1A, the second diffraction grating layer 320 of the first diffraction substrate 100 is separated from the other surface of the second diffraction substrate 200 . Also, as shown in FIG. 1B, the first diffraction grating layer 310 of the first diffraction substrate 100 is separated from the other surface of the second diffraction substrate 200 . Further, as shown in FIG. 1C, the second diffraction grating layer 320 of the first diffraction substrate 100 is spaced apart from the third diffraction grating layer 330 of the second diffraction substrate 200 . Also, as shown in FIG. 1D, the first diffraction grating layer 310 of the first diffraction base 100 is separated from the third diffraction grating layer 330 of the second diffraction base 200 .

According to one embodiment of the present invention, the first diffractive substrate and the second diffractive substrate can be attached in a spaced apart manner via a spacer. 1A to 1D, one end of the first diffraction base 100 and one end of the second diffraction base 200, and the other end of the first diffraction base 100 and the second diffraction base The other end of 200 is connected by spacer 400 . The spacer may have a known structure capable of connecting the first diffraction base material and the second diffraction base material, and the spacer may be elastic.

According to one embodiment of the present invention, each of the thicknesses of the first diffractive substrate and the second diffractive substrate may be 0.1 mm or more and 2 mm or less. Referring to FIG. 1A, the thickness h1 of the first diffraction substrate 100 is 0.5 mm to 1.8 mm, 0.8 mm to 1.6 mm, 1 mm to 1.4 mm, 0.7 mm to 1 mm. Below, it may be 1.1 mm or more and 1.8 mm or less, or 1.3 mm or more and 1.5 mm or less. The first diffraction grating layer is provided on one side of the first diffraction substrate having the thickness described above, and the second diffraction grating layer is provided on the other side, thereby forming the first diffraction grating layer and the second diffraction grating layer. can be adjusted within the range described above. By adjusting the distance between the first diffraction grating layer and the second diffraction grating layer to the range described above, the first diffraction base material effectively separates the first light and the second light from the incident light. It can be divided and separated. Furthermore, it is possible to provide a first diffraction base material with excellent diffraction efficiency for light.

Further, the thickness of the second diffraction base material may be 0.1 mm or more and 2 mm or less, and is the thickness of the second diffraction base material the same as the thickness of the first diffraction base material? , can be different.

According to one embodiment of the present invention, the first diffraction grating layer separates light with a wavelength of 550 nm or more and 700 nm or less, the second diffraction grating layer separates light with a wavelength of 400 nm or more and 550 nm or less, The third diffraction grating layer can separate light with a wavelength of 450 nm or more and 650 nm or less. Specifically, the first diffraction grating layer can separate the first light having a wavelength value of 550 nm or more and 700 nm or less from the light incident on the first diffraction grating layer. Also, the second diffraction grating layer can separate a second light having a wavelength value of 400 nm or more and 550 nm or less from light incident on the second diffraction grating layer. Further, the third diffraction grating layer can separate third light having a wavelength value of 450 nm or more and 650 nm or less from light incident on the third diffraction grating layer.

The wavelength values of the light separated by the first diffraction grating layer, the second diffraction grating layer, and the third diffraction grating layer can be measured using a device for measuring the wavelength value of light in the art. As an example, it can be measured using an optical wavelength measuring device (86120C, Agilent Technologies).

According to one embodiment of the present invention, for a diffractive light guide plate including a first diffractive substrate 100 and a second diffractive substrate 200 as shown in FIG. When the first diffraction grating layer 310 is irradiated with the first incident light including light having various wavelength values, the first diffraction grating layer 310 has a wavelength value of 550 nm to 700 nm from the first incident light. can be separated. Thereafter, when the second incident light separated from the first incident light is reflected or totally reflected inside the first diffraction substrate 100 and is irradiated to the second diffraction grating layer 320, the second diffraction grating layer 320 is irradiated with the second incident light. The grating layer 320 can separate the second light having a wavelength value of 400 nm to 550 nm from the second incident light. After that, when the third incident light separated from the second incident light is irradiated to the third diffraction grating layer 330, the third diffraction grating layer 330 has a wavelength of 450 nm or more and 650 nm or less from the third incident light. A third light having a wavelength value can be separated.

Further, as shown in FIG. 1B, when the first incident light is applied to the second diffraction grating layer 320 with respect to the diffraction light guide plate including the first diffraction base 100 and the second diffraction base 200, the second The grating layer 320 can separate the second light from the first incident light. Thereafter, when the second incident light separated from the first incident light is irradiated to the first diffraction grating layer 310, the first diffraction grating layer 310 separates the first light from the second incident light. can do. Thereafter, when the third incident light separated from the second incident light is irradiated to the third diffraction grating layer 330, the third diffraction grating layer 330 separates the third light from the third incident light. can do.

Furthermore, in the case of the diffraction light guide plates of FIGS. 1C and 1D, the first light, the second light, and the third light are separated from the first incident light by the same method as the diffraction light guide plate of FIGS. 1A and 1B. be done.

According to one embodiment of the present invention, said first diffractive substrate comprising a first diffraction grating layer on one side and a second diffraction grating layer on the other side is arranged such that the light incident on the first diffractive substrate is The first light and the second light can be more effectively divided and separated. Specifically, the first diffraction base includes a first diffraction grating layer on one surface and a second diffraction grating layer on the other surface. The first light having a wavelength value is separated, and the second diffraction grating layer separates the second light having a wavelength value of 400 nm or more and 550 nm or less, thereby preventing crosstalk between the first light and the second light. (cross talk) can be prevented from occurring. That is, a crosstalk phenomenon occurs between the first light separated by the first diffraction grating layer provided on the single first diffraction substrate and the second light separated by the second diffraction grating layer. By preventing this, the thickness and weight of the diffractive light guide plate can be reduced, and at the same time, the light separation efficiency of the first diffractive substrate can be improved. In addition, it is possible to improve the light diffraction efficiency of the first diffractive base material, and to effectively suppress the occurrence of the double image phenomenon and the chromatic dispersion phenomenon.

FIG. 2A shows the in-coupling angle and out-coupling of the first diffraction substrate provided with the first grating layer and the second grating layer according to one embodiment of the present invention. FIG. 2B shows the in-coupling angle and the out-coupling angle of the diffractive substrate provided with the first grating layer and the third grating layer. - indicates the out-coupling angle. Specifically, FIG. 2A shows in-coupling and out-coupling angles of a first diffractive substrate provided with a first grating layer and a second grating layer according to one embodiment of the present invention. and a diagram showing a form in which light incident on the first diffraction base material is reflected within the base material. Also, FIG. 2B is a diagram showing in-coupling angles and out-coupling angles of a diffractive substrate provided with a first grating layer and a third grating layer, unlike an embodiment of the present invention. and a form in which light incident on the diffraction base material is reflected within the base material.

Referring to FIG. 2A, the first diffraction grating layer for separating light with a wavelength of 550 nm to 700 nm and the second diffraction grating layer for separating light with a wavelength of 400 nm to 550 nm according to an embodiment of the present invention. In the case of the first diffractive substrate comprising a layer, no crosstalk phenomenon occurs in the first diffractive substrate, no double images occur in the field of view, and as set in the first diffractive substrate It can be confirmed that light diffraction occurs. In contrast, referring to FIG. 2B, the first grating layer separates light with a wavelength of 550 nm to 700 nm and the third grating layer separates light with a wavelength of 450 nm to 650 nm. In the case of a diffractive substrate, a crosstalk phenomenon occurs in the diffractive substrate, and the crosstalk phenomenon causes double images and chromatic dispersion phenomena in the viewing range, and the light is different from what is set in the diffractive substrate It can be confirmed that diffraction occurs.

At this time, the in-coupling angle and out-coupling angle of the diffractive substrate in FIGS. 2A and 2B are used in the industry for simulating the in-coupling angle and out-coupling angle of the diffractive substrate. / or can be measured using a method.

In the present invention, the in-coupling angle and the out-coupling angle of the diffractive substrate can be simulated using Equation 1 below.
[Formula 1]
sin(θ _in )−sin(θ _out )=λ(1/b−1/a)
In Equation 1, θ _in means an in-coupling angle, and θ _out means an out-coupling angle. In Equation 1, λ is the wavelength, a is the period of the diffraction grating that diffracts the incident light into the diffraction substrate, and b is the diffraction grating that diffracts the light inside the diffraction substrate to the angle of the outgoing light. is the cycle of If the in-coupling and out-coupling occur in the same plane, i.e., a=b, the angles of the incoming and outgoing light are the white circles located in the viewing range in FIGS. 2A and 2B. are identical as expressed in On the other hand, if the in-coupling and the out-coupling occur in different planes, that is, if a≠b, then the in-coupling angle and the out-coupling angle are different, which depends on the wavelength. chromatic dispersion occurs. FIG. 2A is the result of calculating the out-coupling angle according to the in-coupling angle when a is 468 nm and b is 405 nm, or when a is 405 nm and b is 468 nm. expressed in FIG. 2B is the result of calculating the out-coupling angle according to the in-coupling angle when a is 468 nm and b is 340 nm, or when a is 304 nm and b is 468 nm. expressed in

According to one embodiment of the present invention, the optical refractive index of each of the first to third diffraction grating layers may be 1.5 or more and less than 2. Each of the first to third diffraction grating layers may have a refractive index of 1.5 to less than 2.0 with respect to light with a wavelength of 400 nm to 700 nm.

Specifically, the optical refractive index of each of the first to third diffraction grating layers is 1.55 or more and 1.9 or less, 1.6 or more and 1.8 or less, or 1.7 or more and 1.8 or less. , 1.5 to 1.8, or 1.55 to 1.75.

Each of the first diffraction grating layer, the second diffraction grating layer, and the third diffraction grating layer having the optical refractive index within the range may have excellent diffraction performance with respect to incident light. When the optical refractive index of each of the first diffraction grating layer to the third diffraction grating layer is within the above range, the problem of second-order diffraction and the reduction of the optical diffraction efficiency of the diffraction light guide plate can be effectively suppressed. can do.

Also, the optical refractive indices of the first diffraction grating layer, the second diffraction grating layer, and the third diffraction grating layer may be the same or different.

According to one embodiment of the present invention, the optical refractive index of the diffraction grating layer, the optical refractive index of the diffraction substrate, and the like can be measured using a method for measuring optical refractive index generally in the industry. can. As an example, a prism coupler (SPA-4000) or an ellipsometry can be used to measure the optical refractive index.

According to one embodiment of the present invention, each of said _first grating layer, _second grating layer and _third grating layer is _TiO2 , _{Al2O3 , Ga2O3} , TeO2, ZrO2. , Ta ₂ O ₅ , Nb ₂ O ₅ , ZnS, HfO, MoO, CuO, and the like. However, it does not limit the high refractive components contained in the first diffraction grating layer, the second diffraction grating layer, and the third diffraction grating layer. The optical refractive index of the diffraction grating layer can be controlled by adjusting the content and type of the high refractive component contained in the diffraction grating layer.

According to one embodiment of the present invention, each of the first diffraction grating layer, the second diffraction grating layer, and the third diffraction grating layer contains a thermosetting resin or a photocurable resin containing a high refractive component. can be done. Specifically, the thermosetting resin or photosetting resin can include acrylic resins such as urethane acrylate and epoxy acrylate, polyamide resins, polyimide resins, silicon resins, epoxy resins, polyester resins, and the like. The type is not limited.

According to one embodiment of the present invention, the optical refractive indices of the first grating layer and the second grating layer may be the same as or different from the optical refractive index of the first diffraction substrate. Further, the optical refractive index of the third diffraction grating layer and the second diffraction substrate may be the same or different.

According to one embodiment of the present invention, each of the first to third diffraction grating layers has a first region where light is incident, a second region where incident light is diffused and moved, and a moving region. and a third region from which the light is extracted, wherein the first regions are included in corresponding positions of the first to third diffraction grating layers, and the third region is the third region. They are included in positions corresponding to each other from the first diffraction grating layer to the third diffraction grating layer.

FIG. 3 is a diagram schematically showing a plane of a first diffraction grating layer according to one embodiment of the present invention. Specifically, FIG. 3 shows a first region 511 including a first region 511 where light is incident, a second region 512 where the incident light is diffused and moved, and a third region 513 where the moved light is extracted. 3 is a diagram showing a plane of a diffraction grating layer 310; FIG. As shown in FIG. 3, a first region 511 to a third region 513 are sequentially provided from one side A to the other side B of the first diffraction grating layer 310 . At this time, the pattern structure of the first diffraction grating layer is omitted from FIG.

Referring to FIG. 3, the first area 511 may be an area where incident light including light having various wavelength values is incident. In addition, the second region 512 is a region where light incident on the first diffraction grating layer 310 is diffracted, and a region where light incident on the first region 511 is expanded to the third region 513 . could be. The third area 513 is an area from which light is extracted. When the diffraction light guide plate is used in a display unit, the third area 230 is an area adjacent to the user's eyeball of the display unit, from which light is extracted. It may be an area that is displayed to provide display information to the user. Also, similar to the first grating layer shown in FIG. 3, the second and third grating layers may also include first to third regions.

FIG. 4 is a diagram schematically showing a cross section of a first diffraction substrate including a first diffraction grating layer according to one embodiment of the present invention; Specifically, FIG. 4 illustrates that after light enters the first area 511, the light is extracted in the third area 513 to provide display information to the user. In FIG. 4, the second diffraction grating layer included on the other surface of the first diffraction base material and the second diffraction base material are omitted from the illustration. Also, as shown in FIG. 4, the second diffraction grating layer and the third diffraction grating layer can also extract the light incident on the first region through the third region.

According to one embodiment of the present invention, each of the first to third diffraction grating layers may include a diffraction pattern. The diffraction pattern can include two or more pattern structures.

FIG. 5 is a schematic diagram of a first grating layer including a diffraction pattern according to one embodiment of the present invention. Specifically, FIG. 5 is a diagram showing a diffraction pattern including two or more pattern structures provided along the direction from one side A to the other side B of the first diffraction grating layer 310 . In FIG. 5, the second diffraction grating layer included on the other surface of the first diffraction substrate is omitted. Similar to that shown in FIG. 5, the second grating layer and the third grating layer have a diffraction pattern comprising two or more pattern structures provided along the direction from one side to the other side of the grating layer. can contain.

According to an embodiment of the present invention, the first diffraction grating layer, the second diffraction grating layer, and the third diffraction grating layer are formed according to the form of the diffraction patterns included in the first to third diffraction grating layers. The wavelength values of the light separated from the light incident on may be different.

FIG. 6 is a diagram schematically showing a cross section of a diffraction pattern included in a first diffraction grating layer according to one embodiment of the invention. Specifically, FIG. 6 shows a diffraction pattern comprising two or more patterned structures. In FIG. 6, the second diffraction grating layer included on the other surface of the first diffraction substrate is omitted. Referring to FIG. 6, a pattern structure is provided at an inclination angle of θ1 from one surface of the first diffraction substrate 100, the pattern structure has a height of h2, and two or more pattern structures are provided. are provided with a pitch of d1. In the present invention, the 'period' means the interval at which the pattern structure is repeated, and as shown in FIG. can mean the length between One point of one pattern structure and one point of another pattern structure may mean positions corresponding to each other between the pattern structures.

Referring to FIG. 6, the pattern structures included in the diffraction pattern of the first diffraction grating layer 310 according to an embodiment of the present invention are inclined at an angle of 50° or more and less than 90° from one surface of the first diffraction substrate 100. provided at an angle θ1. Also, the two or more pattern structures may have a period d1 of 100 nm to 600 nm, and the height h2 of the pattern structures may be more than 0 nm and 600 nm or less. Specifically, the pattern structure included in the first diffraction grating layer may be 55° to 80°, 60° to 75°, 65° to 85°, 50° to 65°, or 70° 80 degrees or less may be sufficient. The two or more pattern structures are provided with a period of 150 nm to 500 nm, 200 nm to 400 nm, 250 nm to 350 nm, 150 nm to 250 nm, 350 nm to 450 nm, or 500 nm to 600 nm. Further, the height of the pattern structure may be 10 nm to 500 nm, 50 nm to 400 nm, 100 nm to 350 nm, 150 nm to 250 nm, 450 nm to 550 nm, or 300 nm to 400 nm.

According to an embodiment of the present invention, similar to said first grating layer, said second grating layer and said third grating layer may comprise two or more pattern structures, said pattern structures The body is provided at an angle of inclination of 50° or more and less than 90° from one side of the diffractive substrate. Also, the two or more pattern structures may be provided with a period of 100 nm or more and 600 nm or less, and the height of the pattern structures may be more than 0 nm and less than or equal to 600 nm. Specifically, the pattern structure included in each of the second diffraction grating layer and the third diffraction grating layer is 50° to 80°, 55° to 70°, 65° to 75°, or 70° 80 degrees or less may be sufficient. The two or more pattern structures are provided with a period of 125 nm to 450 nm, 250 nm to 350 nm, 200 nm to 400 nm, 150 nm to 300 nm, 350 nm to 400 nm, or 500 nm to 655 nm. Further, the height of the pattern structure may be 30 nm to 500 nm, 100 nm to 400 nm, 150 nm to 300 nm, 200 nm to 250 nm, 450 nm to 550 nm, or 300 nm to 400 nm.

According to one embodiment of the present invention, the forms of diffraction patterns included in the first diffraction grating layer, the second diffraction grating layer and the third diffraction grating layer may be different. As an example, the pattern structures included in the diffraction pattern of the first diffraction grating layer and the pattern structures included in the diffraction pattern of the second diffraction grating layer have the same period, but the inclination of the pattern structures Angles and heights can be different. Further, the pattern structure included in the diffraction pattern of the second diffraction grating layer and the pattern structure included in the diffraction pattern of the third diffraction grating layer have the same height, but the tilt angle of the grating is different. can be different.

Therefore, according to one embodiment of the present invention, the tilt angle formed by the pattern structures included in the diffraction pattern of the diffraction grating layer with respect to the diffraction substrate, the pitch between the pattern structures, and the height of the pattern structures The thickness can be adjusted to easily control the wavelength value of light separated from light incident on the grating layer, the optical refractive index of the grating layer, and the diffraction efficiency of the light.

FIG. 7 shows simulation results of the optical diffraction efficiency of the diffraction grating layer according to the duty, height, and optical refractive index of pattern structures included in the diffraction grating layer according to one embodiment of the present invention. Specifically, in FIG. 7A, the optical refractive index (n) of the diffraction grating layer is set to 1.8, and the height (depth) is set to 300 nm. It shows the simulation result of the optical diffraction efficiency. In addition, FIG. 7B shows the optical refractive index (n) of the diffraction grating layer set to 1.8 and the duty (duty) set to 0.6, and the light of the diffraction grating layer according to the height of the pattern structure. 4 shows simulation results of diffraction efficiency. Further, FIG. 7(c) shows a diffraction grating layer whose duty is 0.6 and whose depth is 300 nm and which corresponds to the refractive index of the pattern structure. Fig. 3 shows simulation results of the optical diffraction efficiency of .

Referring to FIGS. 7(a) to 7(c), the duty and height of the pattern structures included in the diffraction grating layer and the optical refractive index of the diffraction grating layer are adjusted according to an embodiment of the present invention. Thus, it can be confirmed that the optical diffraction efficiency of the diffraction grating layer can be easily controlled.

At this time, the simulations in FIGS. 7(a) to 7(c) can be calculated using an apparatus and/or method for calculating the optical diffraction efficiency of a diffractive substrate in the art. , can be calculated using VirtualLab SoftWare, which utilizes the Rigorous Coupled Wave Analysis algorithm.

8A and 8B are diagrams schematically showing cross sections of a diffractive light guide plate including first to third diffraction grating layers according to one embodiment of the present invention. Specifically, FIG. 8A shows first diffraction patterns 311, 321, 331, second diffraction patterns 312, 322, and 332 included in second regions 512, 522, and 532, and third diffraction patterns 313, 323, and 333 included in third regions 513, 523, and 533. FIG. 8B shows first diffraction patterns 311 and 321 included in first regions 511 and 521 and second diffraction patterns included in second regions 512 and 522 of first diffraction grating layer 310 and second diffraction grating layer 320, respectively. The patterns 312 and 322 and the third diffraction patterns 313 and 323 included in the third regions 513 and 523 are shown. Fig. 10 shows that a third diffraction pattern 333 and two second regions 532, 532' each include a second diffraction grating pattern 332, 332'.

According to one aspect of the present invention, the first regions are included in corresponding positions of the first to third diffraction grating layers, and the third regions are the first diffraction grating layers. layer to the third diffraction grating layer at positions corresponding to each other. That is, the first regions included in each of the first to third diffraction grating layers are aligned to be provided at positions corresponding to each of the first to third diffraction grating layers. be done. The third regions included in each of the first to third diffraction grating layers are aligned so as to be provided at positions corresponding to each of the first to third diffraction grating layers. be done.

According to one embodiment of the present invention, a location provided with a first region of the first grating layer, a location provided with a first region of the second grating layer, and a first region of the third grating layer The positions at which the regions are provided can correspond to each other. Specifically, the positions of the first diffraction grating layer to the third diffraction grating layer including the first region may be the same, and the positions of the first diffraction grating layer to the third diffraction grating layer including the third region may be the same. The positions of the layers may be identical to each other.

According to one embodiment of the present invention, the position where the first region of the first diffraction grating layer is provided and the position where the first region of the second diffraction grating layer is provided can correspond, and The position where the first region of the second diffraction grating layer is provided can correspond to the position where the first region of the third diffraction grating layer is provided, and the position where the first region of the first diffraction grating layer is provided. can correspond to the position where the first region of the third diffraction grating layer is provided. Further, the position where the third region of the first diffraction grating layer is provided, the position where the third region of the second diffraction grating layer is provided, and the position where the third region of the third diffraction grating layer is provided are mutually can respond. That is, the position where the third region of the first diffraction grating layer is provided can correspond to the position where the third region of the second diffraction grating layer is provided, and the third region of the second diffraction grating layer can correspond to the position where the third region of the second diffraction grating layer is provided. can correspond to the position where the third region of the third diffraction grating layer is provided, and the position where the third region of the first diffraction grating layer is provided and the position of the third diffraction grating layer can correspond to the position where the third region of is provided.

Further, an area between the first regions and an area between the third regions aligned to correspond to each other from the first diffraction grating layer to the third diffraction grating layer may be substantially the same. In the present invention, "the area is substantially the same" means not only that the area is exactly the same, but also that the area including minute errors that may occur in manufacturing is the same. can also

8A and 8B, the positions of the first regions 511, 521, and 531 included in the first diffraction grating layer 310, the second diffraction grating layer 320, and the third diffraction grating layer 330 correspond to each other. can do. Also, the positions of the third regions 513, 523, 533 included in the first diffraction grating layer 310, the second diffraction grating layer 320, and the third diffraction grating layer 330 may correspond to each other. That is, the first region and the third region included in each of the first to third diffraction grating layers are provided at positions corresponding to the first to third diffraction grating layers. Furthermore, each of the first regions included in the first to third diffraction grating layers may have substantially the same area, and each of the first to third diffraction grating layers may have substantially the same area. may have substantially the same area. A display to which the diffraction light guide plate is applied by forming the first region and the third region included in the first diffraction grating layer, the second diffraction grating layer, and the third diffraction grating layer at positions corresponding to each other. The quality, such as sharpness, of the images realized by the unit can be improved.

Meanwhile, according to an embodiment of the present invention, the second regions included in each of the first diffraction grating layer, the second diffraction grating layer, and the third diffraction grating layer are provided at positions corresponding to each other, or provided for different positions. Referring to FIG. 8A, second regions 512, 522, and 532 included in the first diffraction grating layer 310, the second diffraction grating layer 320, and the third diffraction grating layer 330 are provided at positions corresponding to each other. . Also, referring to FIG. 8B, the second regions 512 provided in the first diffraction grating layer 310 and the second regions 532 and 532' provided in the third diffraction grating layer 330 are formed in different positions and areas. may

According to an embodiment of the present invention, the first to third diffraction grating layers may include first and third regions, and optionally include second regions. As an example, the first grating layer and the third grating layer may include the first to third regions, and the second grating layer may include only the first and third regions.

According to one embodiment of the present invention, a plurality of first regions, second regions, and third regions included in each of the first diffraction grating layer, the second diffraction grating layer, and the third diffraction grating layer are formed. be done. As an example, the third diffraction grating layer may include one first region, two second regions, and one third region. Referring to FIG. 8B, the third grating layer 330 can include two second regions 532, 532', each of which has a second diffraction pattern 332, 332'. can include

According to one aspect of the present invention, the first diffraction pattern, the second diffraction pattern, and the third diffraction pattern included in each of the first to third diffraction grating layers have different forms. may As an example, the pattern structure included in the first diffraction pattern of the first diffraction grating layer and the pattern structure included in the second diffraction pattern of the first diffraction grating layer are different from each other. The corners, heights, widths, etc. may be different. Further, the pattern structure included in the first diffraction pattern of the first diffraction grating layer and the pattern structure included in the first diffraction pattern of the second diffraction grating layer are defined in the tilt direction of the pattern structure, Inclination angles, heights, widths, etc. may be different.

FIG. 9 is a schematic diagram of a first diffraction grating layer including first to third diffraction patterns according to one embodiment of the present invention. Specifically, FIG. 9 shows the tilt directions and tilt directions of the pattern structures included in the first diffraction pattern 311, the pattern structures included in the second diffraction pattern 312, and the pattern structures included in the third diffraction pattern 313. FIG. 3 is a diagram showing first diffraction grating layers 310 having different angles, periods, and heights; In FIG. 9, the second diffraction grating layer included on the other surface of the first diffraction substrate is omitted.

Referring to FIG. 9, the tilt direction, tilt angle, and tilt angle formed by the pattern structures included in the first diffraction pattern 311, the second diffraction pattern 312, and the third diffraction pattern 313 of the first diffraction grating layer 310 with respect to the diffraction substrate. By adjusting the period of the pattern structure and the height of the pattern structure, the efficiency of separating the first light from the light incident on the first diffraction grating layer and the diffraction efficiency of the light with respect to the first diffraction substrate are improved. be able to. Further, as with the first diffraction grating layer, the tilt directions and tilt angles of the pattern structures included in the first diffraction pattern, the second diffraction pattern, and the third diffraction pattern of the second diffraction grating layer and the third diffraction grating layer , the period of the pattern structures, and the height of the pattern structures can be adjusted.

Therefore, according to one embodiment of the present invention, a diffraction grating that can manufacture a display that realizes a clear image can be manufactured by adjusting the tilt angle, period, height, etc. of the pattern structures included in the diffraction pattern of the diffraction grating layer. A light guide plate can be provided.

According to an embodiment of the present invention, the third regions of the first to third diffraction grating layers may have optical refractive indices that gradually increase from one side to the other side.

In a conventional diffractive light guide plate, the light diffraction efficiency is the same in all areas where light is extracted to provide display information to the user. If the light diffraction efficiency is the same over the entire area of the diffraction light guide plate where light is diffracted, the amount of light diffracted by the diffraction light guide plate decreases while the light is reflected or totally reflected inside the diffraction light guide plate. Specifically, when light is incident on one side of the diffraction light guide plate and is guided to the other side of the diffraction light guide plate, the amount of light diffracted in the diffraction area increases from one side to the other side of the diffraction light guide plate. decreases. When the amount of diffracted light is different for each part of the diffractive light guide plate, high-intensity light is emitted from a part with a large amount of diffracted light, but low-intensity light is emitted from a part with a small amount of diffracted light. Therefore, in the case of the conventional diffractive light guide plate, the light diffraction efficiency is not the same in the entire light extraction area, and the luminous intensity of the light extracted from each part of the light extraction area may be uneven. .

On the other hand, according to an embodiment of the present invention, the optical refractive index of the third regions of the first to third diffraction grating layers may gradually increase from one side to the other side. can. The third region is a region from which light is extracted, and the third region has a gradual increase in optical refractive index from one side to the other so that the amount of light extracted from each portion of the third region is The light intensity can be constant. Therefore, according to an embodiment of the present invention, it is possible to realize a diffractive light guide plate capable of providing the user with display information having the same luminosity.

In addition, like the third region, the optical refractive index of the first region and/or the second region included in each of the first to third diffraction grating layers gradually increases from one side to the other side. can do.

According to an embodiment of the present invention, the third region may include a diffraction pattern including slanted pattern structures whose heights gradually increase from one side to the other side. Specifically, the third region includes a diffraction pattern including slanted pattern structures whose heights gradually increase from one side to the other side, thereby increasing the optical refractive index from one side to the other side of the third region. can be increased progressively. Referring to FIG. 9, the third region 513 includes a diffraction pattern including an inclined pattern structure whose height gradually increases from one side A to the other side B of the third region 513 . The optical refractive index may gradually increase from one side to the other side of the third region. As the optical refractive index gradually increases from one side to the other side of the third region, the optical diffraction efficiency may gradually increase from one side to the other side of the third region.

Therefore, according to one embodiment of the present invention, the height of the inclined pattern structure included in the third region of the first to third diffraction grating layers is increased in the direction from one side of the third region to the other side. By gradually increasing along the direction of the third region, the light intensity is prevented from decreasing while the light is diffracted from one side of the third region to the other side, and the luminous intensity of the light emitted from each portion of the third region is prevented. can be made constant.

In addition, like the third region, the first region and/or the second region included in each of the first to third diffraction grating layers gradually increase in height from one side to the other side. A diffraction pattern comprising tilted pattern structures can be included.

According to an embodiment of the present invention, the third area may include a pattern structure whose duty increases gradually from one side to the other side. In the present invention, the 'duty' may mean a value obtained by dividing the width of the pattern structure by the period of the pattern structure (width of pattern structure/period of pattern structure). Referring to FIG. 6, the duty of the pattern structure may be d2/d1, which is the width d2 of the pattern structure divided by the period d1 of the pattern structure.

According to an embodiment of the present invention, the third region includes a pattern structure whose duty gradually increases from one side to the other side, thereby increasing the optical refractive index from one side to the other side of the third region. It can be increased incrementally. As the duty of the pattern structure gradually increases from one side to the other side of the third area, the optical refractive index may gradually increase from one side to the other side of the third area. can. As the optical refractive index gradually increases from one side to the other side of the third region, the optical diffraction efficiency may gradually increase from one side to the other side of the third region. As an example, by setting the period of the pattern structures to be the same and gradually increasing the width of the pattern structures, the duty of the pattern structures is gradually increased from one side to the other side of the third region. can be increased.

According to an embodiment of the present invention, the duty of the pattern structures included in the third region may be 0.1 or more and 1.0 or less. By adjusting the duty of the pattern structure included in the third region to the range described above, the third region having excellent light diffraction efficiency can be realized.

According to one embodiment of the present invention, the period of the two or more pattern structures is set to be the same, and the width of the pattern structures is gradually increased from one side to the other side of the third region, thereby forming the pattern. The duty of the structure can be progressively increased from one side of the third region to the other.

Further, like the third region, the first region and/or the second region included in each of the first to third diffraction grating layers has a pattern in which the duty increases gradually from one side to the other side. Can contain structures.

One embodiment of the present invention includes providing a first diffractive substrate comprising a first grating layer on one side and a second grating layer on the other side, and a third grating layer on one side. Provide a method for manufacturing a diffractive light guide plate according to an embodiment of the present invention, comprising the steps of preparing a second diffractive substrate and bonding the first diffractive substrate and the second diffractive substrate. .

According to one embodiment of the present invention, it is possible to easily manufacture a diffractive light guide plate with reduced thickness and weight.

The first diffraction base material, the second diffraction base material, and the diffraction light guide plate manufactured by the method for manufacturing a diffraction light guide plate according to one embodiment of the present invention are composed of the first diffraction base material according to one embodiment of the present invention, It may be substantially the same as the second diffractive base material and the diffractive light guide plate.

According to one embodiment of the present invention, the step of preparing the first diffraction substrate includes forming the first diffraction grating layer on one surface of the first substrate and forming the first diffraction grating layer on the other surface of the first substrate. The first diffraction substrate may be manufactured by forming the second diffraction grating layer. Specifically, after forming the first diffraction grating layer on one surface of the first substrate, the second diffraction grating layer can be formed on the other surface of the first substrate. Also, the first diffraction grating layer and the second diffraction grating layer may be simultaneously formed on one surface and the other surface of the first base material.

According to one embodiment of the present invention, the step of preparing the first diffraction base includes: a first base having the first diffraction grating layer on one side and a second diffraction grating layer on one side; Additional substrates provided can be bonded together to produce a first diffractive substrate. Specifically, after forming a first diffraction grating layer on one surface of the first substrate and forming a second diffraction grating layer on one surface of the additional substrate, the other surface of the first substrate and The first diffractive base material can be manufactured by joining the other surface of the additional base material.

According to one embodiment of the present invention, the other surface of the first base material and the other surface of the additional base material are bonded via an adhesive layer. The adhesive layer can maintain an optical refractive index of 1.5 or more and less than 2.0. By bonding the first base material and the additional base material using an adhesive layer that maintains the optical refractive index within the range described above, a first diffractive base material having excellent optical diffraction efficiency can be produced. can.

According to one embodiment of the present invention, the adhesive layer may include an adhesive film or an adhesive. Specifically, the adhesive film that maintains the optical refractive index described above can be used, and the adhesive that can form the adhesive layer that maintains the optical refractive index described above can be used.

According to one embodiment of the present invention, each of the first diffraction grating layer to the third diffraction grating layer is formed using an imprint process using a photocurable resin composition and an imprint mold.

According to one embodiment of the present invention, the step of preparing the first diffraction substrate includes coating a photocurable resin composition on the first substrate and forming a diffraction pattern on the surface of the photocurable resin composition. can be imprinted using a mold having an intaglio surface. After that, the photocurable resin composition can be irradiated with light to photocure the photocurable resin composition. As a result, the first substrate having the first diffraction grating layer formed on one surface can be manufactured. The intaglio grating pattern of the mold may correspond to the pattern of the first grating layer.

According to one embodiment of the present invention, a photocurable resin composition is applied to the other surface of the first substrate on which the first diffraction grating layer is formed, and the photocurable resin composition is coated on the other surface of the first substrate. A diffraction pattern can be imprinted on the surface of the film using a mold having an intaglio surface. After that, the photocurable resin composition can be irradiated with light to photocure the photocurable resin composition. The intaglio grating pattern of the mold can correspond to the pattern of the second grating layer. As a result, the first diffraction base material having the first diffraction grating layer formed on one side and the second diffraction grating layer formed on the other side can be manufactured.

According to one embodiment of the present invention, the step of photocuring the photocurable resin composition is performed simultaneously with the step of imprinting a mold on the surface of the photocurable resin composition, or the mold is removed. It may be done later.

According to one embodiment of the present invention, after the first diffraction grating layer is formed on one surface of the first base material, a release film or the like is attached to the first diffraction grating layer to form the first base material. The first grating layer may be protected during the process of forming the second grating layer on the other side.

Further, according to one embodiment of the present invention, the photocurable resin composition is simultaneously applied on one surface and the other surface of the first substrate, and the photocurable resin composition is applied on the one surface and the other surface of the first substrate. The surface of the photocurable resin composition may be imprinted simultaneously using a mold.

According to one embodiment of the present invention, the step of preparing the first diffraction substrate includes coating a photocurable resin composition on the first substrate and forming a diffraction pattern on the surface of the photocurable resin composition. can be imprinted using a mold having an intaglio surface. Then, the photocurable resin composition is photocured to manufacture a first substrate having a first diffraction grating layer formed on one surface thereof. A photocurable resin composition can be applied onto an additional substrate, and the surface of the photocurable resin composition can be imprinted using a mold having an intaglio surface with a diffraction pattern. After that, the photocurable resin composition can be photocured to produce an additional substrate having a second diffraction grating layer formed thereon. After that, the other surface of the first base material and the other surface of the additional base material are bonded via an adhesive layer to manufacture the first diffraction base material.

According to one embodiment of the present invention, a photocurable resin composition is applied onto a second substrate, and a diffraction pattern is imprinted on the surface of the photocurable resin composition using a mold having an intaglio surface. can do. The intaglio grating pattern of the mold can correspond to the pattern of the third grating layer. Then, the photocurable resin composition is photocured to manufacture a second substrate having a third diffraction grating layer formed on one surface thereof.

According to _one embodiment of the present invention, the photocurable resin composition includes _TiO2 , _{Al2O3 , Ga2O3} , _TeO2 , _ZrO2 , _Ta2O5 , _{Nb2O5 , ZnS} , A photocurable resin containing at least one of high refractive components such as HfO, MoO, CuO may be included. Specifically, the photocurable resin is cured by light irradiation, and the photocurable resin is an acrylic photocurable resin such as a urethane acrylate photocurable resin, an epoxy acrylate photocurable resin, or a polyamide. A photo-curable resin, a polyimide-based photo-curable resin, a silicon-based photo-curable resin, an epoxy-based photo-curable resin, a polyester-based photo-curable resin, etc. may be included, but the types thereof are not limited.

According to one embodiment of the present invention, after applying a photocurable resin composition containing a photocurable resin containing a high refractive component onto a substrate, the photocurable resin composition is photocured, A grating layer can be formed on the substrate. Specifically, a photocurable resin composition containing an acrylic photocurable resin containing ZrO ₂ as high refractive particles is applied by a spin-coating method, and is photocurable at a temperature of about 80°C. After drying the resin composition for about 3 minutes, the photocurable resin composition may be photocured by irradiating ultraviolet rays having an intensity of 100 mW/cm ² or more at a temperature of about 40° C. for 60 seconds or more.

According to one embodiment of the present invention, the optical refractive index of each of the first substrate, the second substrate and the additional substrate may be 1.5 or more and less than 2.0. Substrates commonly used in the art can be included as long as the substrate maintains the optical refractive index within the range described above. Specifically, glass containing at least one high refractive component such as TiO ₂ , Al ₂ O ₃ , Ga ₂ O ₃ , TeO ₂ , ZrO ₂ , Ta ₂ O ₅ , Nb ₂ O ₅ and ZnS as the substrate. , or a resin film or the like containing at least one of the above-mentioned high refractive components can be used, but the type of substrate is not limited.

According to an embodiment of the present invention, the mold can be made taking into account the diffraction patterns contained in the first and second grating layers. As the mold, any mold used in the industry can be used without limitation. Specifically, metals and alloys such as nickel and nickel alloys, hard molds containing amorphous metals, or polyethylene terephthalate can be used. ) can be used. Also, the mold may be transparent.

According to one embodiment of the present invention, when imprinting is performed on the surface of the photocurable resin composition using a mold, the surface of the photocurable resin composition and the surface of the mold provided with the pattern are formed. A mold provided with supports can be used to improve the contact of the . Specifically, the contact between the surface of the photocurable resin composition and the surface of the mold provided with the pattern is improved by providing a support portion on the other surface of the mold having an intaglio pattern on one surface. can be improved to increase imprint efficiency. The support part may include a support layer made of polyethylene terephthalate (PET) or urethane material, an elastic layer provided on one surface of the support layer, and an elastic layer containing PDMS (polydimethylsiloxane). does not limit the types of Also, the support layer and the elastic layer included in the support may be transparent, and the elastic layer of the support may be positioned on the other surface of the mold.

FIG. 10 is a schematic illustration of preparing a first diffractive substrate using two substrates according to one embodiment of the present invention. Specifically, in FIG. 10, after applying and drying the photocurable resin composition 700 on one surface of the first substrate 610 and one surface of the additional substrate 620, the other surface of the first substrate 610 and After facing the other surface of the additional substrate 620, a mold 810 having one surface engraved with a pattern provided on the first diffraction grating layer and one surface engraved with a pattern provided on the second diffraction grating layer. FIG. 8 schematically shows imprinting with a mold 820 having a thickness; Referring to FIG. 10, a support containing PET and PDMS and a support containing urethane and PDMS are provided on the other surfaces of molds 810 and 820 where no pattern is formed, and a photocurable resin composition is prepared. and the one side of the mold provided with the pattern can be improved.

According to one embodiment of the present invention, each of the first to third diffraction grating layers is formed using a lithography process or a laser etching process. Specifically, after applying a photocurable resin composition on one surface of the first substrate and photocuring it, the surface of the cured product formed on one surface of the first substrate is subjected to a lithography process or laser etching. By forming a diffraction pattern using the process, a first diffraction grating layer can be formed on one surface of the first substrate. A second diffraction grating layer can be formed on the other surface of the first substrate and a third diffraction grating layer can be formed on one surface of the second substrate in the same manner as in the above method.

According to one embodiment of the present invention, the step of bonding the first diffractive substrate and the second diffractive substrate includes using spacers to ensure that the grating layer of the first diffractive substrate is aligned with the second diffractive substrate. It can be bonded so as to be spaced apart from the substrate. Specifically, spacers are provided between one end of the first diffraction base and one end of the second diffraction base, and the other end of the first diffraction base and the other end of the second diffraction base. can be connected via The spacer may have a known structure capable of connecting the first diffraction base material and the second diffraction base material, and the spacer may be elastic.

According to one embodiment of the present invention, the first diffraction grating layer or the second diffraction grating layer is separated from the other surface of the third diffraction grating layer or the second diffraction base, A substrate and said second diffractive substrate can be bonded. That is, the first diffraction grating layer or the second diffraction grating layer included in the first diffraction base material is the third diffraction grating layer or the second diffraction grating layer included in the second diffraction base material. The first diffractive base and the second diffractive base can be combined via a spacer so that they do not come into contact with the other surface.

Another embodiment of the present invention provides a display unit including a diffractive light guide plate according to one embodiment of the present invention. The display unit can realize a provided image in Augmented Reality (AR), Mixed Reality (MR), or Virtual Reality (VR).

[Example]
EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples in order to specifically describe the present invention. Embodiments of the invention, however, may be modified in many different forms, and the scope of the invention should not be construed as limited to the embodiments set forth below. The examples herein are provided so that the invention will be more fully understood by those of ordinary skill in the art.

Example 1
Propylene glycol monomethyl ether acetate (PGMEA) as a solvent, ZrO ₂ as high refractive particles, dipentaerythritol hexaacrylate (DPHA) as a monomer, Irgacure 184 as a photoinitiator. A curable resin composition was prepared.

The prepared photocurable resin composition was applied to one surface of the first substrate and one surface of the additional substrate, and dried at a temperature of 80° C. for about 3 minutes. Thereafter, the surface of the photocurable resin composition on the first substrate is imprinted using a mold in which a predetermined pattern of the first diffraction grating layer is engraved, and a predetermined second diffraction grating layer is formed. imprinted the surface of the photocurable resin composition on the additional substrate using a mold engraved with a pattern of . In the process of imprinting, the photocurable resin composition is photocured by irradiating with ultraviolet rays having an intensity of 100 mW/cm ² or more at a temperature of about 40° C. for 60 seconds or more to form the first diffraction grating layer. An additional substrate was fabricated with the first substrate and the second grating layer laminated. After that, the other surface of the first substrate and the other surface of the additional substrate are bonded with an adhesive to form a second substrate including the first diffraction grating layer on one surface and the second diffraction grating layer on the other surface. A 1-diffractive substrate was produced.

The prepared photocurable resin composition was applied to one surface of the second substrate and dried at a temperature of 80° C. for about 3 minutes. After that, the surface of the photocurable resin composition on the second substrate was imprinted using a mold in which a predetermined pattern of the third diffraction grating layer was engraved. In the process of imprinting, the photocurable resin composition is cured by irradiating ultraviolet rays having an intensity of 100 mW/cm ² or more at a temperature of about 40° C. for 60 seconds or more, thereby forming a third diffraction grating layer on one surface. A second diffractive substrate comprising:

Thereafter, after positioning the other surface of the first diffraction base and the other surface of the second diffraction base so as to face each other, one end of the first diffraction base and one end of the second diffraction base, The other end of the first diffractive base and the other end of the second diffractive base were connected by a spacer. Thus, a diffractive light guide plate including the first diffractive substrate and the second diffractive substrate was manufactured.

Section analysis of the first diffraction grating layer and the second diffraction grating layer Cross sections of the first diffraction grating layer and the second diffraction grating layer manufactured in Example 1 were analyzed using an electron microscope (S-1400, Hitachi, Ltd.). did.

11A is a scanning electron microscope (SEM) photograph of the first grating layer according to Example 1 of the present invention, and FIG. 11B is a scanning electron microscope (SEM) photograph of the second grating layer according to Example 1 of the present invention. It is a photograph. Specifically, FIG. 11A (A) is a photograph of the first diffraction grating layer at a magnification of 5,000, and FIG. 11A (B) is a photograph of the first diffraction grating layer at a magnification of 15,000. 11A(C) is a photograph of the first diffraction grating layer taken at a magnification of 100,000. FIG. 11B(A) is a photograph of the second diffraction grating layer at a magnification of 5,000, and FIG. 11B(B) is a photograph of the second diffraction grating layer at a magnification of 15,000. FIG. 11B(C) is a photograph of the second diffraction grating layer taken at a magnification of 100,000.

11A and 11B, a method according to an embodiment of the present invention facilitates a diffractive light guide plate including a first diffractive substrate provided with a first grating layer and a second grating layer. You can confirm that it is manufacturable.

100: First diffraction base material 200: Second diffraction base material 310: First diffraction grating layer 320: Second diffraction grating layer 330: Third diffraction grating layer 311, 321, 331: First diffraction pattern 312, 322, 332 , 332′: second diffraction pattern 313, 323, 333: third diffraction pattern 400: spacer 511, 521, 531: first region 512, 522, 532, 532′: second region 513, 523, 533: third Region 610: First substrate 620: Additional substrate 700: Photocurable resin composition 810, 820: Mold

Claims (13)

comprising a first diffractive substrate and a second diffractive substrate provided on the first diffractive substrate;
the first diffractive substrate includes a first diffractive grating layer on one side and a second diffractive grating layer on the other side;
the second diffraction substrate includes a third diffraction grating layer on one surface;
The first diffraction grating layer separates light with a wavelength of 550 nm or more and 700 nm or less,
The second diffraction grating layer separates light with a wavelength of 400 nm or more and 550 nm or less,
The third diffraction grating layer separates light with a wavelength of 450 nm or more and 650 nm or less,
Each of the first to third diffraction grating layers has a first region where light is incident, a second region where the incident light is diffused and moved, and a third region where the moved light is extracted. including
A first diffraction pattern is included in the first regions of the first diffraction grating layer, the second diffraction grating layer and the third diffraction grating layer, and a second diffraction pattern is included in the first diffraction grating layer and the second diffraction grating layer. contained in the second region of the grating layer and the third grating layer, and a third diffraction pattern in the third region of the first grating layer, the second grating layer and the third grating layer is included and
The diffraction light guide plate, wherein the first diffraction pattern, the second diffraction pattern and the third diffraction pattern included in the first diffraction grating layer have different forms. 2. The diffractive light guide plate according to claim 1, wherein each of said first diffractive base material and said second diffractive base material has a thickness of 0.1 mm or more and 2 mm or less. 3. The diffractive light guide plate according to claim 1, wherein the diffraction grating layer of the first diffraction base is separated from the second diffraction base. the first regions are included in positions corresponding to each other in a direction perpendicular to the surface of the first diffraction substrate or the second diffraction substrate in each of the first diffraction grating layer to the third diffraction grating layer;
The third region is included in each of the first diffraction grating layer to the third diffraction grating layer at positions corresponding to each other in a direction perpendicular to the surface of the first diffraction base or the second diffraction base. The diffractive light guide plate according to any one of claims 1 to 3, wherein 5. The diffractive light guide plate of claim 4, wherein the third region of the first to third diffraction grating layers has a refractive index that gradually increases from one side to the other side. 5. The diffractive light guide plate of claim 4, wherein the third region includes a diffraction pattern including slanted pattern structures whose heights gradually increase from one side to the other side. 5. The diffractive light guide plate of claim 4, wherein the third region includes a diffraction pattern including a pattern structure whose duty increases gradually from one side to the other side. providing a first diffractive substrate comprising a first grating layer on one side and a second grating layer on the other side;
providing a second diffractive substrate including a third grating layer on one side;
The method of manufacturing a diffractive light guide plate according to claim 1, comprising bonding the first diffractive substrate and the second diffractive substrate. The step of preparing the first diffraction substrate includes forming the first diffraction grating layer on one surface of the first substrate and forming the second diffraction grating layer on the other surface of the first substrate. 9. The method of manufacturing a diffractive light guide plate according to claim 8, wherein the first diffractive substrate is manufactured. The step of preparing the first diffraction base material includes bonding a first base material having the first diffraction grating layer thereon and an additional base material having the second diffraction grating layer thereon. 9. The method of manufacturing a diffractive light guide plate according to claim 8, wherein the first diffractive base material is manufactured. 9. The diffraction light guide plate according to claim 8, wherein each of said first diffraction grating layer to said third diffraction grating layer is formed by an imprinting process using a photocurable resin composition and an imprint mold. manufacturing method. 9. The method of manufacturing a diffraction light guide plate according to claim 8, wherein each of said first diffraction grating layer to said third diffraction grating layer is formed using a lithography process or a laser etching process. The step of combining the first diffraction substrate and the second diffraction substrate uses a spacer to bond the diffraction grating layer of the first diffraction substrate and the second diffraction substrate apart from each other. 9. The method for manufacturing a diffraction light guide plate according to claim 8, wherein

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